Set up custom network ports (for HTTP and HTTPS)

Hello. I would like to expose my website via opening certain network ports. Why "certain" you may ask. Well, my ISP allows me to open ports only via PCP (Port Control Protocol), meaning, i request to open port for my internal service, and he will assign me some port. The usable port range is from port ~1500 to ~2000. This means i cannot use default compatible network port written down in Cloduflare's documentation (https://developers.cloudflare.com/fundamentals/reference/network-ports/).

I tried to set up Origin Rule to change port (it was template). This would mean that all incoming traffic from clients would get re-routed to destination port defined by me (my IPS respectively). However, this could not work as ALL the incoming traffic would go to that one port. I cannot specify that only HTTP traffic to be re-routed to that specified port by me. Is there some other possibility to set up custom HTTP and HTTPS port within cloudflare?
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